The Spike® anchor is formed with an "s" shaped configuration at the working end of the anchor to create an expansion mechanism

7/8-14 x 4 Hex Cap Screw SS 18-8 (A2)

1 3/8-6 x 11 Socket Cap Screw Alloy

3/4-10 x 12 Socket Cap Screw Alloy

3/4-16 x 2 Hex Cap Screw SS 18-8 (A2)

1 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank) 5/8-11 Hex Cap Screws 316 Stainless Steel The Spike® anchor is formed1 x 6 Reduced Shank Drill Bit Cobalt (1 2 Shank) . Expands the size range capacity of a 1 2 inch portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Precision ground for high degree of concentricity between shank and body diameter. Ideal for drilling in low and medium tensile strength materials.